A pregnant lady 38 weeks gestation diagnosed for pre- eclampsia is receiving magnesium therapy. Which of the following parameters should be assessed on priority basis?

1. A

   Respiratory rate

2. B

   Urine output

3. C

   Airway clearance

4. D

   Knee jerk

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

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• Magnesium sulfate is a central nervous system (CNS) depressant used to prevent seizures in patients with severe pre-eclampsia.
• The most severe and life-threatening adverse effect of magnesium sulfate is respiratory depression, which can progress to respiratory arrest.
• According to the principles of patient safety (Airway, Breathing, Circulation), monitoring respiratory rate is the highest priority to detect this critical complication early.
• A respiratory rate below 12 breaths per minute is a late and dangerous sign of magnesium toxicity, indicating the need for immediate intervention, such as stopping the infusion and administering the antidote, calcium gluconate.

Why Other Options Were Wrong

• Option B: Monitoring urine output is crucial because magnesium is excreted through the kidneys, and oliguria (low urine output) can lead to toxic accumulation. However, this is a factor that contributes to toxicity over time, whereas respiratory depression is an immediate, life-threatening event.
• Option C: Airway clearance is not directly affected by magnesium sulfate unless the patient experiences a seizure or has a severely depressed level of consciousness due to profound toxicity. In such cases, respiratory depression would already be a primary and more direct concern.
• Option D: The loss of the knee jerk reflex (or any deep tendon reflex) is the earliest sign of magnesium toxicity. While it is a vital assessment, it precedes the more life-threatening complication of respiratory depression.

Related Visual

• Visual 1: Chart - Progression of Magnesium Toxicity. A chart showing the signs and symptoms of magnesium toxicity correlated with increasing serum magnesium levels, starting with loss of deep tendon reflexes, followed by respiratory depression, and finally cardiac arrest. This visual helps learners understand the sequence and severity of complications.
• Visual 2: Flowchart - Nursing Actions for Suspected Magnesium Toxicity. A flowchart starting with the assessment of a low respiratory rate (less than 12/min), leading to the immediate actions: 1) Stop the magnesium infusion, 2) Call for help, 3) Administer calcium gluconate as ordered, 4) Prepare for respiratory support.

Clinical Relevance

• Nursing practice connection: Knowing Priority nursing assessment during magnesium sulfate therapy for pre-eclampsia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Magnesium sulfate is a high-alert medication. Nurses must be vigilant in monitoring for toxicity. The antidote, calcium gluconate, must be immediately accessible at the bedside.
• Patient safety is paramount. Applying the ABC (Airway, Breathing, Circulation) framework helps prioritize assessments. Respiratory depression is a direct threat to 'Breathing' and is therefore the top priority.
• What if? If the patient's knee jerk reflex is absent but their respiratory rate is 14 breaths/min and urine output is adequate, the nurse should still notify the provider immediately as this is the first sign of toxicity. The magnesium infusion may be stopped or the rate decreased, but the situation is less emergent than if the respiratory rate were low.

How to Approach the Question

• First, identify the core of the question: it asks for the priority assessment for a patient on magnesium sulfate.
• Recall the primary action and major risks of magnesium sulfate. It's a CNS depressant, and its most dangerous side effect is toxicity leading to respiratory and cardiac arrest.
• Apply the ABCs (Airway, Breathing, Circulation) principle to prioritize the options. Respiratory depression directly impacts 'Breathing'.
• Evaluate each option based on the ABCs and the progression of magnesium toxicity.
• Option A (Respiratory rate) relates to 'Breathing' and is a direct measure of a life-threatening complication.
• Options B (Urine output) and D (Knee jerk) are important for monitoring the development and early signs of toxicity, but they are not as immediately life-threatening as respiratory failure.

Concept Tested & Keywords

• Concept Tested: Priority nursing assessment during magnesium sulfate therapy for pre-eclampsia.
• Stem keywords: pre-eclampsia, magnesium therapy, priority basis, pregnant
• Lead-in keywords: priority
• Clinical cues: Patient is receiving magnesium therapy, a high-alert medication known for causing CNS depression.

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